/*
 * Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
 * Original author: Edmund Wagner
 * Creation date: 23.05.2007
 *
 * Source: $HeadURL$
 * Last changed: $LastChangedDate$
 * 
 * the unrar licence applies to all junrar source and binary distributions 
 * you are not allowed to use this source to re-create the RAR compression algorithm
 * 
 * Here some html entities which can be used for escaping javadoc tags:
 * "&":  "&#038;" or "&amp;"
 * "<":  "&#060;" or "&lt;"
 * ">":  "&#062;" or "&gt;"
 * "@":  "&#064;" 
 */
package de.innosystec.unrar.io;

import gnu.crypto.cipher.Rijndael;

import java.io.IOException;


/**
 * DOCUMENT ME
 *
 * @author $LastChangedBy$
 * @version $LastChangedRevision$
 */
public interface IReadOnlyAccess {

	/**
	 * @return the current position in the file
	 */
	public long getPosition() throws IOException;
		
	/**
	 * @param pos the position in the file
	 * @return success ? true : false 
	 */
	public void setPosition(long pos) throws IOException;

    /** Read a single byte of data. */
    public int read() throws IOException;

	/**
     * Read up to <tt>count</tt> bytes to the specified buffer.
     */
    public int read(byte[] buffer, int off, int count) throws IOException;

    /**
     * Read exactly <tt>count</tt> bytes to the specified buffer.
     *
	 * @param buffer where to store the read data
	 * @param count how many bytes to read
	 * @return bytes read || -1 if  IO problem 
	 */
	public int readFully(byte[] buffer, int count) throws IOException;

    /** Close this file. */
    public void close() throws IOException;    
    
    public void setSalt(byte[] salt);
    
    public void initAES(Rijndael rin, byte[] salt, byte[] AESInit, byte[] AESKey);

	public void readFully(byte[] tr, int i, int j) throws IOException;
	
	public void resetData();
	
	public int paddedSize();
}
